Ok bearing in mind I have rolled off the drive at least 3 times in the last fortnight believing I had fixed this problem ?
I swapped the cables and the problem stayed with the right hand lever/cable
Changed the brake lever and problem still the same , getting there
Symptom was hard to pull lever and a grating feeling with the lever being slow to return ?
After swapping lever I noticed that the cable was no longer free , on the Mk1 the cables travel forward to the brakes.
When brakes are on the rear wheels the cables loop around the bars to be tied to the frame , every time I tried to fix this the cable was free when the handlebars were moved a few times [ like riding it ! ] the cable was looping behind the bulb horn and getting caught on the trumpet making it a tight 90' turn when bars were straight .
First problem found and solved.
Once I removed the horn the brakes were a bit better.
However I was now left with the grating feeling , I noticed that the good side had plastic ferrules and the bad side had metal ferrules.
So I cut up a new cable outer/inner to length and added plastic ferrules ...
Unbelievable it now feels even easier that the left side that I though was quite good
So rolled off the drive and found I had a completely different trike , in the wet I can now lockup either rear wheel if I want to , however the brakes are sensitive enough to stop rapidly with little drama.
So NOW I can start adding some miles , I still have the SA levers and now the parking brake on the right lever also works for the first time
I may still use the old V brake as a parking brake with a friction gear lever as backup [ cos that's what I am like
]
regards Paul big grin Python Pilot